PLUS (MT)

Alan Alda in Scientific American Frontiers"The Dark Side of the Universe"
Alda joins astronomers as they wrestle with implications of their latest discoveries that indicate we see only a tiny fraction of the cosmos. Much of it may be dark matter or dark energy.G

9:00 pm

My Brother The Jihadist
Film-maker Robb Leech sets out to discover why his step-brother, Rich, a white middle-class man from Dorset became a radical Islamist. Robb first heard of his brother's conversion in a national newspaper in the summer of 2009. The article said Rich had converted under Anjem Choudary, leader of the radical Muslim group Islam4UK, which was later banned under Britain's anti-terror laws. D

10:00 pm

NOVA"Manhunt - Boston Bombers"
At 2:50pm on April 15, two bomb blasts turned the Boston Marathon finish line from a scene of triumph to tragedy. NOVA follows the manhunt for the bombers step by step, examining the role modern technology -- combined with old-fashioned detective work -- played in cracking the case.G

11:00 pm

Alan Alda in Scientific American Frontiers"Cars That Think"
The fully automatic car may be down the road a ways, but cars that do your thinking for you are just around the corner - they watch out for hazards, they listen to you, they read your lips, they even know when you're distracted. D

11:30 pm

EcoSense for Living"Green Buildings"
Green Buildings profiles homes, a school and even the third busiest sports and concert venue in the nation to illustrate how energy efficient buildings reduce our carbon footprint in remarkable ways. Atlanta's Phillips Arena was retrofitted with energy efficient systems and it now uses 21% less electricity than other arenas of similar size and the energy the facility saves in one year could power 111 private homes. This episode also profiles Arabia Mountain High School which focuses on environmental learning throughout its curricula using Promethean boards (to reduce paper and enhance learning), outdoor classrooms, and even energy- and water-efficient rest rooms. D